Fair Value, Changes in Fair Value of Assets Recorded at Fair Value on Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Mortgage loans held for sale (LOCOM)	$ 20	$ 7
Loans held for sale	0	(82)
Loans	(153)	(188)
Nonmarketable equity securities	149	208
Other assets	(18)	(22)
Total	(2)	(77)
Total Commercial [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Loans	(74)	(81)
Total Consumer [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Loans	$ (79)	$ (107)

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Increase Decrease In Fair Value Assets Measured On Nonrecurring Basis Loans Held For Sale

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Increase Decrease In Fair Value Assets Measured On Nonrecurring Basis Mortgages Held For Sale

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